Revert "Merge pull request #245 from pkozlov/pkozlov-to_encoding"
Revert "Merge pull request #245 from pkozlov/pkozlov-to_encoding"

This reverts commit e31c9669870d5a70fde94065d5a04256b7052b99, reversing
changes made to a4ea2cf9ece508fc28fbd29b82e87e4e7f8d5995.

Akoten/django-import-export,pajod/django-import-export,brillgen/django-import-export,bmihelac/django-import-export,django-import-export/django-import-export,jnns/django-import-export,bmihelac/django-import-export,django-import-export/django-import-export,luto/django-import-export,Akoten/django-import-export,daniell/django-import-export,bmihelac/django-import-export,ylteq/dj-import-export,pajod/django-import-export,django-import-export/django-import-export,jnns/django-import-export,brillgen/django-import-export,PetrDlouhy/django-import-export,Akoten/django-import-export,PetrDlouhy/django-import-export,pajod/django-import-export,copperleaftech/django-import-export,luto/django-import-export,PetrDlouhy/django-import-export,Apkawa/django-import-export,pajod/django-import-export,piran/django-import-export,rhunwicks/django-import-export,django-import-export/django-import-export,PetrDlouhy/django-import-export,manelclos/django-import-export,ylteq/dj-import-export,daniell/django-import-export,sergei-maertens/django-import-export,daniell/django-import-export,manelclos/django-import-export,brillgen/django-import-export,jnns/django-import-export,manelclos/django-import-export,Apkawa/django-import-export,copperleaftech/django-import-export,luto/django-import-export,rhunwicks/django-import-export,ylteq/dj-import-export,jnns/django-import-export,daniell/django-import-export,piran/django-import-export,ericdwang/django-import-export,ericdwang/django-import-export,Apkawa/django-import-export,copperleaftech/django-import-export,rhunwicks/django-import-export,sergei-maertens/django-import-export,brillgen/django-import-export,ericdwang/django-import-export,copperleaftech/django-import-export,sergei-maertens/django-import-export,piran/django-import-export,bmihelac/django-import-export